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(No Model.) 4 SheetsSheet 1 L. E. HARPER & R. P. DOW. MACHINE FORGRINDING OR DRESSING METAL.-

No. 596,503 1 Patented Jan. 4, 1898.

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- 4 Sheets-Sheet 2. L. E. HARPER & R. I. DOW. MACHINE FOR GRINDING 0RDRESSING METAL.

Patented Jan. 4, 1898.

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(No Model L. E. HARPERK: R. P. DOW MACHINE FOR GRINDING 0R DRESSINGMETAL.

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(No Model.) 4' SheetsSheet 4.

L. E. HARPER 82; R. P. DOW

MACHINE FOR GRINDING 0R DRESSING METAL.

No. 596,503. Pate nted Jan.4,1898.

Witnesses:

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UNITED STATES PATENT EEicE.

LElVIS E. HARPER AND RICHARD F. DOXV, OF HARTFORD, CONNECTICUT,ASSIGNORS TO THE PRATT & XVHITNEY COMPANY, OF SAME PLACE.

MACHINE FORGRINDING OR DRESSING METAL.

SPECIFICATION forming part of Letters Patent No. 596,503, dated January4, 1898. Application filed May 10,1897. Serial No. 635,782. (No modeli)ing or dressing metal, the object being to pro vide an improved andefficient machine of this character for grinding or dressing articles ofvarious shapes with uniform accuracy and finish, said machine beingparticularly adapted for finishing inside Work of irregular form, suchas the metallic cups or boxes for bicycle bearing-balls.

In the drawings accompanying and forming part of this specification,Figure 1 is a plan View of our improved machine. Fig. 2 is a sideelevation of the same. view of the tool mechanism, a portion being intransverse central section. Fig. 4 is a similar view with the head ortable removed to show the two auxiliary slides. Fig. 5isafragmentaryview in plan of a portion of the mechanism with the two auxiliary slidesremoved. Figs. 6 and 7 are perspective views of the auxiliary slides.Fig. Sis a bottom plan view of the upper section of one of the mainslides,showing the mechanism contained therein. portion of themechanism, showing other parts of the means for actuating the tool. Fig.10 is a cross-section taken in the line Ct a, Fig. 8.

Fig. 11 is a similar View, the section being taken in the line b b, Fig.3. Figs. 12 and 13 are details in plan and elevation, respectively, ofone of the elements of the tool-actuating mechanism. Figs. 14, 15, 16,and 17 are sectional elevations showing the work in a chuck and theaction of the tool in traversing a rectangular path. Fig. 18 is a planview of a pattern or form for causing the tool to accomplish the workshown in Figs. 14 to 17, inclusive, said views also illustratingintransverse section a guide-pin. Fig. 19 is a side elevation of saidpattern or form with the guidepin extending therethrough. Fig. 20 is asectional elevation of the work and the tool, the latter being in theact of finishing a curved Fig. 3 is a plan' Fig. 9 is a plan view of thelower surface. Fig. 2l is a plan view of the pat- I tern or form forcausing the tool to accomplish the work shown in Fig. 20, and Fig. 22 isa similar view of apattern or form to be used for a diiferent kind ofwork.

Similar characters designate like parts in all the figures of thedrawings.

The framework for sustaining the various parts of the machine may be ofany suitable character, it consisting in the present case of the base 2,the standard 3, rising therefrom, and the longitudinal bed 4, secured tosaid standard and supporting the tool and chuck mechanism.

The tool mechanism comprehends, preferably, as a part thereof twoadjustable main slides reciprocatory in transverse planes, the toolbeing mounted on one of said slides, so that an attendant may move thesame toward and from the work. The two main slides are designated,respectively, by 5 and 6, the slide 6 being carried by the slide 5 andthe slide 5 being adj ustably mounted on the bed 4. The lower main slide5 is longitudinally grooved on its under side, as at 7, to receive theguide or tongue 8, formed on a third slide 9, directly carried by thebed 4. The slide 9 has a preferably-dovetailed groove or slideway 10 toreceive the head 12 of the holding and adjusting bolt 13, said boltpassing through an elongated slot 14 in the bed 4 and being furnished atits lower end with a thumb-nut 15,whereby when said thumb-nut isloosened the entire device can be simultaneously moved longitudinally ofand maintained in apredetermined position on the bed 4 by tighteningsaid thumb nut 15. The upper portion of the dovetailed groove 10 isadapted to receive the block 16, with which the screw 17 is in threadedengagement, said screw passing through the plate 18, which is partlydisposed in the guideway 10. By loosening the screw the slide 9 can bemoved crosswise of the bed 4 and can be held in the desired position bytightening said screw, it being understood that the stop-plate 18 bearsagainst the bed 4, as shown in Fig. 11, the adjacent bearingfaces ofthese two parts being obliquely formed to fit against each other.

The lower main slide 5 has the usual adj usting-screw suitably securedthereto, the

thread of which is adapted to engage an internal thread formed in theslide 9, said adjusting-screw being furnished with the customary handle21 at its outer end, by which it can be rotated to adjust said slide 5relatively to the slide 9.

The main slide 6, which is suitably guided upon the slide 5 for lateralmovement, is furnished with the adjusting-screw 22, suitably securedthereto,the threaded portion of which is adapted to work in acorrespondinglythreaded bore in the lower main slide 5, said screw beingequipped at its outer end with the operating-handle 23, of ordinaryconstruction, by which the screw can be turned in and out of its bore toadmit of the movement of the upper slide 6.

- As hereinbefore stated, the tool m echanisni proper will be mounted onone of the mainslides, and in the present case the upper main slide 6constitutes a support for'this purpose, said slide being made preferablyin two sections or parts to incase or house the mechanism forreciprocating the tool.

It is to be understood that dressing-tools of various kinds may beemployed to accomplish various classes of Work, either interior or eX-terior, the tool in the present case consisting of a grinder adapted tofinish off inside work.

The tool is illustrated in the form of a beveled grinding-disk G,suitably secured to a spindle or shaft 30, mounted on the head or tableof the machine and preferably detachably held in position, whereby itcan be readily removed, if desired, to substitute another in its place,although a milling or other kind of dressing or polishing tool may besubstituted therefor to suit the character of work being operated upon.

Any suitable means may be employed for securing the tool to itsspindleor shaft, a

v screw 31 being shown for this purpose, said screw passing through acentral aperture in the. tool, and its thread (not shown) being adaptedto engage a cooperating internal thread formed at the working end of thespindle, the head of the screw being designed to bind firmly against theouter face of the tool, and the rear face of the latter fitting againsta shoulder 32 on the spindle, whereby it will be held firmly in place.To substitute a different tool for that illustrated, it is simplynecessary to remove the binding-screw 31, when this operation can bequickly accomplished.

The-spindle 30 is preferably mounted upon the table or head T, saidtable being furnished at suitable points thereon with hubs or bearings33 and 34, respectively, in which the spindle or shaft is designed toturn, said bearings being formed at the upper .ends of the verticalposts 35 and 36, suitably secured to the table. or carriage T, thelatter being preferably supported for movement in an irregular path,either transverse or curvilinear, whereby the tool G, which is mountedthereon, is caused to travel in a coinciding direction.

The spindle or shaft 30 is encircled by the collar 37, which can bedriven into the bore of the bearing or hub 33, the outer endof thebearing-collar 37 being shouldered, as at 38, said shoulder fittingagainst the outside face of said bearing 33, the spindle being providedwith an annular bulge 39, fitting against said shoulder 38. The oppositeor reduced end of the spindle is journaled in the bearing-collar 40,shouldered at 41 at its outer end, said shoulder .being designed to fitagainst a shoulder 42 on the bushing 43, which can be driven into thebore of the bearing 34, the opposite ends of the bushing 43 and thebearing-collar 37 being embraced by removable rings, as 44. The spindleor shaft 30 is preferably held against longitudinal or endwise movementin its bearings by the check collar or nut 45, which is adapted toengage the externally-threaded end of the spindle and to bind againstthe shoulder 41 of the collar 40.

It will be understood that in the present instance, and as hereinbeforeset forth, the tool G is rotary, and any suitable mechanism may beprovided for obtaining this motion.

The driver for rotating the tool consists in the present case of apulley D, which is secured to the spindle or shaft 30. In practice thedriver or pulley will be rotated by a crossbelt, such as 47, passedaround said pulley and also around a pow er-transmittin g pulley ordrum. (Not shown.)

The upper main slide 6, in which the toolreciprocating mechanism issituated, preferably consists of two parts or sections and 51, heldtogether by suitable fastening means, as the screws 52, the uppersection orplate 51 constituting a suitable cover for the other plate orsection, and the slide-plate 51 preferably supporting for reciprocationthe table or carriage T.

The plate 51 on its upper side, near one end thereof, is provided withthe segmental flanges or tracks 53 and 54, constituting a convenientmeans for shiftably supporting the table T and is secured to the plate50 in some suitable manner, the upper faces of the two flanges beingflat or level and serving as a bearing-surface on which the flat underface of the table T is adapted to rest.

In connection with the tool G and its table Or carriage T a plurality oftransversely-reciprocatory auxiliary slides are provided,one of saidslides being carried by the other and both being mounted in the spacebetween the segmental tracks 53 and 54, respectively, means beingprovided for successively operating the two slides, and a similar motionbeing simultaneously imparted to the table '1, and consequently to thetool mounted thereon. The two auxiliary slides are designated, re-

spectively, by 5.5 and 56, each being apertured to receive a suitableguide-pin preferably carried by the tool-carriage, the aperture for theslide 55 being of rectangular shape and designated by 57, and theaperture for the slide 56 being designated by 58.v

The slide has at a point intermediate its ends the cross-piece 59, tothe opposite sides of which are removably secured the gibs and 61, saidgibs being beveled on their inner faces to form, in connection with thecrosspiece 59, a slideway for receiving the auxiliary slide 56. 1

The slide 50 is suitably secured to the under side of the table orcarriage T, the screws 62 and 63 being shown for this purpose.

A pair of recessed lugs or extensions are shown at 65 and 66, havingsquared ends 67 and 68, which are situated in the spaces between theadjacent edges of the two segmental tracks 50 and 54, respectively,suitable means being provided to hold said squared extensions in place,and the recesses of the lugs forming slideways for receiving theopposite ends of the auxiliary slide 55.

The tool table or carriage is preferably equipped with a guide, such asthe depending pin or lug 7 O, suitably fixed centrally thereto, anddriving mechanism is employed to reciprocate the carriage, andconsequently the tool, a pattern of desired shape being used tocooperate with the guide to effect a movement of the table and the toolthereon through a path corresponding with the shape of the pattern. m

The means in the present case for operating the table consists of -adriver for the guide-pin 70, said driver being designated by D andcomprising an oscillatory gear and an actuator 71 in the form of a capsuitably secured to the upper face thereof, said actuator 71 having aradial slot 72 to receive the lower end of the guide-pin 70.

The oscillatory driver or gear D is pivoted at 73 to the lower section50 of the main slide 6 and can be operated in anysuitable manner.

It will be evident that the lower end of the pin being in the slot andthe gear D being suitably oscillated the actuator 71 will move the tableT on its support, and when a suitable pattern is placed between thedriver D and the table T the table will be causedto move in a pathcorresponding with the shape of the pattern.

In Figs. 4c, 5, and 8 a pattern is illustrated for causing the traverseof the carriage T in a rectangular path, the pattern consisting in thepresent case of a disk removably secured in place in the upper section51 of the main slide 6. The pattern or form is designated by 75, andconsists in the present instance of a disk which is seated in a recess 76, formed in the under side of the plate 51, said pattern or disk havinga guide-slot 77 to receive the squared portion 78 of the guide-pin 70,the guide-slot 77 being shown in Figs. 4, 5, 8, and 18 of rectangularshape, although it is apparent from an inspection of Figs. 21 and 22that it may be-of other shape.

0n reference to Figs. 10 and 11 it will be observed that the guide-pin 7O is of a length to pass through the apertures 57 and 58 of theauxiliary slides 55 and 56, the opening 79 in the plate 51, and theguide-slot 77, and partially through the radial slot 72 of the actuator71. At the commencement of the operation the guide-pin 70 is in theguide-slot 77 of the portion at the point 00, (see Fig. 5,) and also inthe slot 77 of the driver D, so that on the movement of said driver theguidepin'70 will be caused to travel along the portion y of theguide-slot and to turn, when it reaches the angle of the slot, into theportion ,2 thereof until the driver D has reached the end of itsmovement, at which time the operation just described will be reversedand the alternate advance and retraction of the guide-pin 70 and table Twill follow so long as the driver D is'in motion.

It will be evident that on the action of the pin in the manner justalluded to the table T will be first moved in a direction correspondingwith the arrow or and subsequently in a direction corresponding with thearrow ,2 and back again through the same path, the plates 56 and 55 byreason of their connection with the table being caused to movesuccessively in transverse planes correspondingwith the movement of thetable and the guide-pin secured thereto.

For the purpose of reciprocating the driver D, and consequently theother parts of the machine depending on the driver for their action, anysuitable means may be employed, the rack 80, suitably driven, beingprovided for the purpose, the teeth 81 of the rack meshing with theteeth 82 of the driving-gear. The rack is removably secured to the block84 by a 1nortise-and-tenon joint, and said block is suitably fastened tothe reciprocatory slide, as by ordinary screws, the block being mountedin the way or groove 86, formed in the under plate 50 of the main slide6, the slide 85 being oppositely beveled along its opposite edges toprevent its displacement.

For the purpose of reciprocating the slide 85 the power-transmittingmember or wormgear 87 is shown, said gear being pivotally mounted, as at87 and provided with a suitable crank adapted to enter the longitudinalslot 88 of the block 84, whereby on the rotation of the gear 87 theblock 84, slide 85, rack 80, and driver D will be operated.

The crank for the gear 87 is designated by 88, it being removably heldin position and is secured to the webs 89 and 90, formed at oppositesides of the eccentricallydooated aperture or opening 91 in theworm-gear 87. The head of the crank 88 is provided with flat sides andis adapted to fit between the opposite webs 89 and 90, and said crank ismaintained in a fixed position by a screw 92 in threaded engagementtherewith.

By loosening the screw 92 the crank-pin 88 may be moved toward or fromthe center of rotation of the gear 87 to vary the stroke of the severalparts deriving their motion therefrom to adapt the machine to differentstyles ICS of work, the screw 92 being adapted to bind against the uppersides of the two webs 89 and 90 to hold the crank in a fixed position.

The worm for rotating the gear 87 is desig-, nated by 95, it beingformed on the inner end of the shaft 96, suitably journaled in the upperplate 51 of the main slide 6, and said worm-shaft 96 may be continuouslyrotated in any suitable manner, as by the band-pulley 97, secured to theshaft, said pulley being connected with a suitable motor (not shown) bya belt 98.

' Any suitablemeans may be employed for holding the work to be operatedupon, an ordinary chuck, as 0, being shown for this purpose.

As hereinbefore stated, our present machine is capable of eflicientlyperforming a variety of work either inside or outside; but for thepurpose of illustrating the operation thereof we have shown a cup orsection of a box generally employed for containing bicycle bearing-ballsas held within the chuck O to be interiorly finished, said cup or boxbeing designated by C.

The chuck O is secured to its spindle 99, supported in suitable hearingsor posts, as 100 and 101, respectively rising from the bed 4, thechuck-spindle 99 being furnished with the usual cone-pulley 102, saidcone-pulley being connected bya belt or band 102 with a similar pulley.(Not shown.) a

In connection with the tool G means are provided for holding the samefirmly against the work, such means in the present case consisting ofthe spring-pressed block 103, situated in the radial slot 72 of theactuator 71, said block being adapted to act against the guide-pin 70,whereby the same is held against the outside wall of the pattern-slot.

The spring which acts against one end of the block 103 is designated by104, it being an extensile spring of substantially Z shape and seatedwithin the recess 105 in the drivercam 71, so that when the pin leavesone branch of the slot it is made to promptly enter the other branch ofsaid slot and thereby cause the tool to act upon the other portion ofthe work.

In operation the attendant will manipulate the several hand-slides tocarry the tool G to and in contact with the outside edge of the innersurface of the cup 0, it being understood that at this time the severalshafts are at rest. The several belts then being shipped to tightpulleys on a line-shaft, (not shown,) the spindle and other shafts ofthe machine will be rotated so that, the pattern or form 75 being inproper position, the tool G, in the manner hereinbefore described,wi1lbe caused to traverse a reciprocatory path corresponding with thepattern to dress out the cup 0.

For the purpose of permitting the tool G to operate evenly andthroughout the entire surface of the inside of said cup the axis ofrotation of the tool-spindle is disposed obliquely to the axis ofrotation of the chuckspindle 99, and consequently to the work held inthe chuck, the tool and chuck spindles being oppositely rotative tosecure a more efficient action, this last-stated operation beingobtained by the crossed belt 47.

In Fig. 21 the pattern 75 is shown as having a guide-slot 77 of curvedform, whereby curvilinear work, as represented in Fig. 20, can beperformed, the periphery of the tool in Fig. 20 being rounded to adaptit to the different kinds of work. In Fig. 22 another style of patternis illustrated, wherein the guide-slot is of compound curvature.

Having described our invention, We claim 1. The combination, with adressing-tool and its table, of a-guide a pattern having an irregularslot to receive the guide and means for engaging the guide to carry itsuccessively into the different portions of the slot and then to returnit.

2. The combination, with a dressing-tool and its table, of a guide; apattern having an irregular slot to receive the guide; a device forengaging the guide to carry it successively into different portions ofthe slot and then to return it; and means for varying the movement ofsaid guide. 7

3. The combination, with a dressing-tool and its table, of a guide onthe table; a pattern having an irregular slot to receive the guide; andoscillatory means for engaging the guide to carry it successively intodifferent portions of the slot and then to return it.

4. The combination, with a dressing-tool and its table, of a guide; apattern; and continuously-operative means for engaging the guide tocarry it in a path coinciding with the pattern and then to return it.

5. The combination, with a dressing-tool and its table mounted formovement in an irregular path, of a guide secured to the table; apattern; and a driver, the pattern and the driver'being slotted toreceive the guide.

6. The combination, with a dressing-tool and its table supported formovement in an irregular path, of a guide secured to the table; apattern; a gear; an actuator secured to the gear, the actuator andpattern being slotted to receive the guide; and means for operating saidgear.

7. The combination, with a support, of a plurality of slides mounted forreciprocatory movement in transverse planes, one of them carried by theother, the carrying-slide being mounted for movement on said support; atrack on said support; a table on the track, having a guide passingthrough apertures of said slides, said table being secured to one of theguides; a pattern; and means for operating the table.

8. The combination, with a dressing-tool and its table, of a cooperatingguide and pattern, one of which parts is connected with the table; apair of slides mounted for movement in transverse planes, one of whichis carried by the other and is secured tothe table; and means foroperating the table.

9; The combination, with a dressing-tool and its table, of a cooperatingguide and pattern, one of which parts is connected with the table; asupport for the slide, furnished with a track for the table; means forsecuring the table to one of the slides; and mechanism for operating thetable.

10. The combination, with a support, of a table on the support; a guide;a pattern having a slot to receive the guide; a pair of slides mountedfor movement in transverse planes and one of them carried by the otherand secured to the table; and table-operatin g means.

11. The combination, with a dressing-tool and its table, of acooperating guide and pattern one of which parts is connected with thetable; a slotted actuator the slot of which is adapted to receive aspring-pressed block and also to receive said guide, against which thespring-pressed block is adapted to act; and means for operating saidactuator.

12. The combination, with a dressing-tool and its table, of acooperating guide and pattern one of which parts is connected with thetable; a driver consisting of a gear and a slotted actuator connected tosaid gear, the guide being located in said slot; a block also located inthe slot of said actuator and adapted to act against said guide; aspring seated in a recess in the actuator and adapted to bear againstsaid block; and means for operating the driver.

13. The combination, with a dressing-tool and its table, of a main slidehaving a track; a table mounted on the track; a plurality of auxiliaryslides one of which is carried by the other and secured to the table formovement therewith, the supporting auxiliary slide being mounted on themain slide; a guide on the table, passing through apertures in theauxiliary slides; a pattern carried by the main slide; and a driver, thepattern and driver being slotted to receive said guide.

14. The combination, with a dressing-tool and its table, of a pair ofapertured slides one of which is connected to the table and is carriedby the other slide; a guide connected to said table and passing throughthe apertures inthe two slides; a pattern the slot of which is adaptedto receive said guide; and means for operating the table.

15. The combination, with a dressing-tool and its table, of a guide onthe table, having a squared portion; a slotted pattern the slot of whichreceives the squared portion of the guide; means for operating thetable; and a springactuated device acting against the guide.

16. The combination, with a dressing-tool and its table, of acooperating guide and pattern one of which is connected with the table;a driver for the table; and means for varyin g the movement of saiddriver.

17. The combination, with a dressing-tool and its table, of acooperating guide and pattern one of which parts is connected with thetable; a driver for said table; a power-transmitting device; andconnections between the power-transmitting device and the driver; andmeans on the power-transmitting device, for varying the movement of thedriver.

18. The combination, with a dressing-tool and its table, of acooperating guide and pattern one of which parts is connected with thetable; a driver for the table; a gear; connections between said gear andthe driver; and a device carried by the gear, for varying the movementof the driver.

19. The combination, with a dressing-tool and its table, of acooperating guide and pattern one of which parts is connected with thetable; a driver for said table; a gear having an adjustable crank; ablock adapted to receive the crank; and a connection between said blockand the driver.

20. The combination, with a dressing-tool and its table, of acooperating guide and pattern one of which parts is connected with thetable; a driver for said table, embodying a gear; a rack meshing withsaid gear; a block connected to the rack; and a gear having a crankadapted to be seated in a slot in said block.

21. The combination, with a dressing-tool and its table, of acooperating guide and pattern one of which parts is connected with thetable; a driver for the table, embodying a gear; a rack meshing withsaid gear; a block connected with the rack; a slide to which said blockis secured; a gear having a crank adapted to be seated in a slot in saidblock; and means for operating said last-mentioned gear.

22. The combination, with a dressing-tool and its table, of acooperating guide and pattern one of which parts is connected with thetable; a driver for said table, embodying a gear; a rack meshing withsaid gear; a slotted block connected with said rack; a slide to whichthe block is secured; a worm-gear provided with a crank seated in theslot of said block; a shaft having a worm meshing with the worm-gear;and a pulley secured to said shaft.

LEWIS E. HARPER. RICHARD F. DOW. Witnesses:

FRED. J. DOLE, HENRY BIssELL.

